THE THERMOSTATIC STEAM TRAP

Transcription

1

2 THE THERMOSTATIC STEAM TRAP The purpose of any steam trap is to discharge, promptly, all condensate (as well as air and other non-condensible gases) without discharging live steam. Since steam is a vapor formed when heat is added to water, it follows that it reverts back to water, or condensate, when heat is extracted. This condensate must be removed from lines and equipment as rapidly as possible, for hot water contains too little heat for efficient performance. Air, too, must be removed, since it lowers the temperature of the steam and acts as an insulator. All steam traps must be classified, broadly, under three types: thermostatic, thermodynamic, and mechanical. Thermostatic traps include bellows and differential metal-expansion designs. The efficiency of an expensive piece of equipment can be reduced as much as 20% through sluggish drainage of condensate and failure to remove air. Proper selection of the right type and size steam trap assures uniform heating and higher temperatures, resulting in increased production. For most heat-transfer applications, an intermittent-action trap is most efficient. Fast, intermittent valve action in the thermostatic bellows trap provides rapid drainage of condensate and venting of air. Thermostatic Bellows Traps operate on two different principles: Fail Close Design - The bellows is partially filled with distilled water under high vacuum and is compressed by the pressure-difference. The valve is now open for discharge. When steam enters, vapor pressure inside the bellows equals trap pressure, permitting spring action of bellows to close the valve fast. As condensate collects, it takes heat from Bellows lowering internal pressure. Line pressure will then compress Bellows to open the valve and then discharge condensate. The valve opening automatically adjusts to load conditions from minimum on light loads to full lift at maximum load. If Bellows fails (seal lost at some point) Bellows will go to its relaxed position which will close the valve. Fail Open Design - The Bellows is filled at its free length with a liquid having a lower boiling point than water. As assembled, the valve is normally open, when steam or very hot condensate enters trap, Bellows fill vaporizes to a pressure higher than line pressure, this forces the valve into the seat orifice to prevent any further flow. Opening of the valve is identical to Fail Close Design. If Bellows fails (seal lost at same point) Bellows will go to its relaxed position which will open valve. PSIG at Inlet 1/2" & 3/4" L-200W LILLY BELLOWS THERMOSTATIC STEAM TRAPS Maximum Capacity in Pounds per Hour Condensate 10 F Below Steam Temperature 1/4" to 3/4" A & AHV 1" A & AHV 1/2" B & C 3/4" B & C TRAP SIZE AND STYLE 1" & 1-1/4" B & C 1-1/2" & 2" B & C 1/2" CS 3/4" CS 1" & 1-1/4" CS 1-1/2" & 2" CS * NOTE: L200WR (3/16 Orifice) = 0.63 x L200W Trap Capacity EFFECT OF BACK PRESSURE ON STEAM TRAP CAPACITY Back Pressure as Percent of Inlet Pressure Percent Reduction of Trap Capacity

3 Lbs. per hr. MODEL L200W APPLICATIONS L-200W Series Thermostatic Steam Traps are designed for a wide range of services including plating tanks, platen presses, unit heaters, sterilizers and various types of cooking and laundry equipment. They are also widely used as air vents for receivers, water heaters and mechanical traps. They are suitable for use on super-heated steam because the trap closes on saturation temperature, and superheated steam cannot reach the trap. The L-200WR Thermostatic Steam Traps are designed for light load applications such as tracer lines and drip legs. DESIGN FEATURES Less maintenance is inherent in the design simplicity of these models. All parts, the bellows, valve and seat, body, and cover, are top quality materials. They are precision-assembled into a steam trapping unit of exceptional efficiency, a trap that functions on just a few degrees temperature differential between steam and condensate to open the trap for fast, positive discharge. CONSTRUCTION In addition to simplicity of design, they are exceptionally rugged in construction. Forged steel body and cover withstand rugged service. Hardened stainless steel valve and valve seat are lapped together for tight positive shut-off. These traps are available with socket weld connections when specified. MODEL L-200W *Full Flow Orifice For Maximum Capacity MODEL L-200WR *Reduced Orifice For Maximum Steam Savings *Fail Open Welded Stainless Steel Bellows *Resistant to Hydraulic Shock *Stainless Steel Internal Strainer MODEL L-200W MODEL L-200WR For pressures from vacuum to 200 psig. Maximum temperature in trap: 500 F with stainless steel bellows. PIPE SIZES: ½ - ¾ Installed horizontally or vertically. Straight through female pipe thread inlet and outlet. Freeze-proof when installed vertically. For capacities see Page 2. Maximum Steam Loss in Fall Open Position (0) (0.7) (1.75) (3.5) (7.0) (14.0) Kg per hr. PSIG (bar, in gauge unit) Graph is based on trap discharging to atmosphere and no load present. Backpressure and load will reduce steam loss. TRAP PIPE VALVE DIMENSIONS MODEL SIZE ORIFICE A B C D WEIGHT L200W 1/2" & 3/4" 1/4" 3 11/16" 3-5/8" 2-7/8" 3 lbs 3

4 MODELS A and AHV APPLICATIONS Types A and AHV are for small and medium size items of equipment with low and medium steam requirements, such as process and storage tanks, sterilizers, and various types of cooking and laundry equipment. Also applicable as automatic air vents for mechanical traps, return traps, receivers and water heaters. Type AHV traps applicable where it is necessary or desirable to have all piping run horizontally or vertically, or close to a floor, wall or pillar. CONSTRUCTION MATERIALS Bronze construction. Valves and seats are hardened stainless steel. Bellows are hydraulically formed from seamless tube, heliarcwelded to end fittings. Silver-brazed sealing plug. Stainless steel bellows recommended for all applications. TYPE A For pressures from vacuum to 200 lbs. Made in five pipe sizes: ¼ - 3/8 - ½ - ¾ - 1 Maximum temperature 425 F inside trap. Horizontal inlet and vertical outlet. Freeze-proof. For capacities see Page 2. Bellow s Material Stainless Steel A-13 A-23 A-33 A-43 A-53 Valve Pipe Size Orifice A B C D W eight 1/4" 5/16" 2-3/8" 2" 4-3/8" 3" 3.4 lbs 3/8" 5/16" 2-3/8" 2" 4-3/8" 3" 3.4 lbs 1/2" 5/16" 2" 1-5/8" 4-3/16" 3" 3.3 lbs 3/4" 5/16" 2" 1-7/8" 4-7/16" 3" 3.3 lbs 1" 3/8" 2-13/16" 2-13/16" 4-15/16" 3-7/16" 4.8 lbs TYPE AHV For pressures from vacuum to 200 lbs. Made in five pipe sizes: ¼ - 3/8 - ½ - ¾ - 1 Maximum temperature 425 F inside trap. Straight-through inlet and outlet. Freeze-proof when installed vertically. For capacities see Page 2. Bellow s Material Stainless Steel AHV-13 AHV-23 AHV-33 AHV-43 AHV-53 Valve Pipe Size Orifice A B C D Weight 1/4" 5/16" 4-3/4" 3/4" 3-7/8" 3" 3.2 lbs 3/8" 5/16" 4-3/4" 3/4" 3-7/8" 3" 3.2 lbs 1/2" 5/16" 4" 3/4" 3-7/8" 3" 3.1 lbs 3/4" 5/16" 4-1/4" 7/8" 4-1/4" 3" 3.6 lbs 1" 3/8" 5-5/8" 1" 4-9/16" 3-7/16" 5.3 lbs 4

5 MODELS B, C and CS APPLICATIONS Types B, C and CS are recommended for the individual drainage of unit heaters, pipe coils, steam mains, high pressure drips, blast coils, dry kilns, jacketed kettles, hot water heaters, driers of all kinds, and many other types of steam-using industrial units of process work. Type B has two outlets, suitable for either horizontal or angle piping. Types C and CS drain completely when cold, and cannot freeze. CONSTRUCTION MATERIALS Types B and C of cast iron construction. Type CS furnished in cast steel. Stainless steel bellows recommended for all applications. Maximum temperature: stainless steel bellows 500 F. Suitable for use on superheated steam. Because the trap closes on saturation temperature, superheated steam cannot reach the trap. Temperature ratings shown are for actual temperature inside the trap, not at the steam main. All bellows are heliarch-welded (not soldered) to end fittings. Type CS available with socket weld connections when specified. TYPE B For pressures from vacuum to 250 lbs. Made in six pipe sizes: ¼ - ½ - 1-1¼ - 1½ - 2 Maximum temperature 450 F inside trap. Horizontal inlet and horizontal or vertical outlet. Not freeze-proof. Pipe plugged drain connections furnished only when specified. For capacities see Page 2. Bellows Material Stainless Steel B-33 B-43 B-53 B-63 B-73 B-83 Valve Pipe Size Orifice A B C D Weight 1/2" 3/8" 3-7/8" 1-1/8" 5-7/8" 4-1/2" 7.0 lbs 3/4" 7/16" 4-1/4" 1-3/8" 6-3/4" 5-1/16" 10.3 lbs 1" 1/2" 5-1/2" 1-7/8" 7-11/16" 5-13/16" 15.6 lbs 1-1/4" 1/2" 5-1/2" 1-7/8" 7-11/16" 5-13/16" 15.3 lbs 1-1/2" 3/4" 7-1/4" 1-3/4" 9-1/16" 7-3/4" 33.6 lbs 2" 3/4" 7-1/4" 1-3/4" 9-1/16" 7-3/4" 32.4 lbs TYPE C AND CS Bellows Material Stainless Steel C-33 C-43 C-53 C-63 C-73 C-83 CS-33 CS-43 CS-53 CS-63 CS-73 CS-83 Type C pressures from vacuum to 250 lbs. (cast iron). Maximum temperature 450 F inside trap. Type CS pressures from vacuum to 300 lbs. (cast steel). Maximum temperature 500 F inside trap. Made in six pipe sizes: ¼ - ½ - 1-1¼ - 1½ - 2 Horizontal inlet and vertical outlet. Freeze-proof. For capacities see Page 2. Valve Pipe Size Orifice A B C D Weight 1/2" 3/8" 2-5/8" 1-13/16" 4-15/16" 4-1/2" 8.3 lbs 3/4" 7/16" 2-3/4" 2-1/16" 5-7/16" 5-1/16" 11.1 lbs 1" 1/2" 3-1/2" 2-13/16" 6-1/16" 5-13/16" 17.8 lbs 1-1/4" 1/2" 3-1/2" 2-13/16" 6-1/16" 5-13/16" 17.5 lbs 1-1/2" 3/4" 5" 3-3/4" 8-3/8" 7-3/4" 39.1 lbs 2" 3/4" 5" 3-3/4" 8-3/8" 7-3/4" 39.0 lbs 1/2" 3/8" 2-5/8" 1-13/16" 4-15/16" 4-1/2" 8.6 lbs 3/4" 7/16" 2-3/4" 2-1/16" 5-7/16" 5-1/16" 13.0 lbs 1" 1/2" 3-1/2" 2-13/16" 6-1/16" 5-13/16" 19.6 lbs 1-1/4" 1/2" 3-1/2" 2-13/16" 6-1/16" 5-13/16" 19.3 lbs 1-1/2" 3/4" 5" 3-3/4" 8-3/8" 7-3/4" 39.2 lbs 2" 3/4" 5" 3-3/4" 8-3/8" 7-3/4" 38.4 lbs 5

6 SALES POLICY Guarantee: The manufacturer guarantees its products to be free from defects in material or workmanship for a period of one year from date of shipment from its factory. Said guarantee will not apply if equipment is used in conditions of service for which it is not specifically recommended. The manufacturer is not responsible for damage or poor operating practice. If any device is found unsatisfactory under the guarantee, the buyer should notify the manufacturer in writing and after receipt of shipping advice, buyer may return it direct to Lilly Steam Trap, Inc., carrying charges prepaid. Such equipment will be replaced or put in perfect operating condition, free of all charges except transportation, and the correction of any defects by repair or replacement by the manufacturer shall constitute fulfillment of all obligations to the purchaser. Manufacturer s Guarantee is void if unauthorized repairs are made to its apparatus, even though defective. Manufacturer shall not be liable for consequential damage in case of any failure to meet the conditions of any Guarantee or Shipping Schedule, nor will claims for labor, loss of profits, repairs or other expenses incidental to replacement be allowed. Lilly Steam Trap, Inc. 427 W. Irving Park Road Itasca, Illinois (630) Fax: (630) info@lillyengineering.com

7 Lilly Steam Traps, Inc. P.O. Box 173 Itasca, IL (630) Fax: (630) Thermostatic Steam Trap, Model L500 L500 Operating Principle Thermal actuator is filled at its free length with a liquid having a lower boiling point than water. As assembled, valve is normally open. When very hot condensate enters trap, thermal actuator fill vaporizes to a pressure higher than line pressure; this forces valve into seat orifice to prevent any further flow. As condensate collects, it takes heat from the actuator lowering internal pressure. Line pressure will then compress thermal actuator to open valve and discharge condensate. Valve opening automatically adjusts to load conditions from minimum on very light loads to full lift at maximum load. Sealed Stainless Steel Body Lightweight, compact, and corrosion resistant. No bolts or gaskets. Eliminates body leaks. Temperature Sensitive Actuators One moving part. Stainless steel, fail open, welded actuator form maximum corrosion, thermal and hydraulic shock resistance. Thermal and Hydraulic Shock Resistant Impingement plate plus welded construction prevents damage to actuator. Valve and Seat Long life. Hardened stainless steel valve and seat. Lapped as a matched set for water tight seal. Maintenance None. Trap is sealed maintenance-free unit. Replacement traps costs less than repair costs of other more expensive in-line repairable traps. Freeze Proof Self draining when installed vertically. Directional Discharge Pipe thread erosion prevented by directing discharge to center of pipe. Guarantee Traps are guaranteed against defects in materials or workmanship Traps with Welded Actuator 1 Year Additional features Best air handling capability for fast start up and operation. Fastest response to condensate load or temperature changes. Broad application range. Selection of orifice and pipe sizes meet majority of condensate removal demands.

8 Thermostatic Steam Trap, Model L500 Applications: B A L500 Unit Heaters Air Vents Cooking Kettles Laundry Equipment Other Process Equipment Drip Legs Platen Presses Plating Tanks Sterilizers L500L Steam Tracing NPT 1/2 3/4 Inch (mm) A B 3-3/4 (94) 3-15/16 (100) 1-3/4 (44) 1-3/4 (44) Weight lb. (kg) 1.1 (0.45) 1.2 (0.54) o Maximum Capacity-lbs/hr 10 F Below Saturation (Kg/hr 5 o C Below Saturation) Trap L500 Orifice Inch (mm) 1/4 (6) 5 (0,34) 550 (249) 10 (0,7) 825 (374) 20 (1,4) 1210 (549) 50 (3,5) 1975 (896) 100 (6,9) 2825 (1281) 125 (8,62) 3140 (1424) 150 (10,3) 3425 (1554) PSIG (bar) 200 (13,8) 3650 (1656) 250 (17,2) 3960 (1796) 300 (20,7) 4100 (1860) 350 (24,1) 400 (27,6) 450 (31,0) 500 (34,5) 600 (41,4) 650 (44,8) L500L 5/64 (2) 84 (38) 119 (54) 168 (76) 265 (120) 348 (158) 375 (170) 398 (181) 439 (199) 472 (214) 502 (228) 529 (240) 553 (251) 575 (261) 595 (270) 1 Welded Thermal Actuator-Fail Open to 150 PSIG 2 Welded Thermal Actuator-Fail Open to 500 PSIG Effects of back pressure on trap capacity Back pressure as percent of inlet pressure Percent reduction of trap capacity Lilly Steam Traps, Inc. P.O. Box 173 Itasca, IL (630) Fax: (630)